I just asked Dreamhost and their current version is 7.0 stable. So, my reading of posts is kiwitrees will be happy at that version. Had no idea 5.6 was stale until I saw the notice.
-----
[updated: 06 Mar 2021]
MacOS: 10.15.7 (Catalina)
Safari 14.0.03; Firefox85.0.2
PHP 7.4 FastCGI
Alter-Drukarsh connections... 3.3.8 <private>
The Royals 3.3.8<royals.rbcsolutions.ca>
The Gerrer Rebbes 3.3.8 <royals.rbcsolutions.ca/index.php?ged=rebbes>